Dynamics of parton cascades in highly relativistic nuclear collisions

Geiger, Klaus; Müller, Berndt

doi:10.1016/0550-3213(92)90280-o

Cited by 354 publications

(416 citation statements)

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“…This results in pressure gradients which drive collective expansion as described by particle transport models [47] or hydrodynamic evolution [7]. Hadronization models are invoked in the final stages of expansion which enable predictions to be compared with experiment.…”

Section: Discussionmentioning

confidence: 99%

Phenomenological analysis of angular correlations in 7 TeV proton-proton collisions from the CMS experiment

Ray

2011

Phys. Rev. D

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A phenomenological analysis is presented of recent two-particle angular correlation data on relative pseudorapidity (η) and azimuth reported by the Compact Muon Solenoid (CMS) Collaboration for √ s = 7 TeV proton-proton collisions. The data are described with an empirical jet-like model developed for similar angular correlation measurements obtained from heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC). The same-side (small relative azimuth), η-extended correlation structure, referred to as the ridge, is compared with three phenomenological correlation structures suggested by theoretical analysis. These include additional angular correlations due to soft gluon radiation in 2 → 3 partonic processes, a one-dimensional same-side correlation ridge on azimuth motivated for example by color-glass condensate models, and an azimuth quadrupole similar to that required to describe heavy ion angular correlations. The quadrupole model provides the best overall description of the CMS data, including the ridge, based on χ 2 minimization in agreement with previous studies. Implications of these results with respect to possible mechanisms for producing the CMS same-side correlation ridge are discussed.

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Section: Discussionmentioning

confidence: 99%

Phenomenological analysis of angular correlations in 7 TeV proton-proton collisions from the CMS experiment

Ray

2011

Phys. Rev. D

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“…We simulate the evolution of an infinite brick of partonic QGP matter with the VNI/BMS parton cascade model [1,2] a fully-relativistic Monte-Carlo transport code which numerically solves the Boltzmann equation,…”

Section: The Parton Cascadementioning

confidence: 99%

“…

AbstractParton Cascade Models (PCM [1][2][3][4]), which describe the full time-evolution of a system of quarks and gluons using pQCD interactions are ideally suited for the description of jet production, including the emission, evolution and energy-loss of the full parton shower in a hot and dense QCD medium. The Landau-Pomeranchuk-Migdal (LPM) effect [5,6], the quantum interference of parton wave functions due to repeated scatterings against the background medium, is likely the dominant in-medium effect affecting jet suppression.

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confidence: 99%

Implementing the LPM effect in a parton cascade model

2011

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Parton Cascade Models (PCM [1][2][3][4]), which describe the full time-evolution of a system of quarks and gluons using pQCD interactions are ideally suited for the description of jet production, including the emission, evolution and energy-loss of the full parton shower in a hot and dense QCD medium. The Landau-Pomeranchuk-Migdal (LPM) effect [5,6], the quantum interference of parton wave functions due to repeated scatterings against the background medium, is likely the dominant in-medium effect affecting jet suppression. We have implemented a probabilistic implementation of the LPM effect [7] within the PCM which can be validated against previously derived analytical calculations by Baier et al (BDMPS-Z) [8][9][10][11][12].

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“…Especially in heavy-ion collisions at very high energies the semihard processes are expected to be abundant and dominate the transverse energy production in the central rapidity region [3]. Event generators emphasizing the importance of semihard processes in ultrarelativistic heavy-ion collisions at √ s ≥ 200 AGeV have also been actively developed during recent years [4,5].Perturbative processes take place at the very early stages of the time evolution of an ultrarelativistic heavy-ion collision [6]. In the central rapidity region, these semihard processes occur at time scales τ ∼ 1/p T , i.e.…”

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Minijet and transverse energy production in the BFKL regime

1996

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Minijet production in hadronic and nuclear collisions through a BFKL pomeron ladder is studied for the energies of the future LHC heavy-ion collisions. We use unintegrated gluon densities compatible with the small-x increase of parton distributions observed at HERA. We show that at LHC energies the BFKL minijet and transverse energy production is at most of the same order of magnitude as that in the collinear factorization approach. CERN-TH/96-124 June 19961 On leave of absence from Laboratory of High Energy Physics, Department of Physics, University of Helsinki, Finland 2 Alexander von Humboldt Fellow, on leave from Lebedev Physics Institute, 117924 Leninski pr. 53, Moscow, Russia Semihard parton scatterings with transverse momenta p T ∼ few GeV have been suggested to explain the rapid growth of the inelastic and total cross sections in high energy pp(p) collisions at √ s > 20 GeV [1,2]. Especially in heavy-ion collisions at very high energies the semihard processes are expected to be abundant and dominate the transverse energy production in the central rapidity region [3]. Event generators emphasizing the importance of semihard processes in ultrarelativistic heavy-ion collisions at √ s ≥ 200 AGeV have also been actively developed during recent years [4,5].Perturbative processes take place at the very early stages of the time evolution of an ultrarelativistic heavy-ion collision [6]. In the central rapidity region, these semihard processes occur at time scales τ ∼ 1/p T , i.e. within the first fractions of fm/c, while the particle production from soft processes is expected to take longer, ∼ 1 fm/c. Therefore, semihard particle production and associated transverse energy production give initial conditions for further space-time evolution of the formed partonic system, which eventually may lead to a thermalized quark-gluon plasma if the produced system is dense enough. The key feature of the semihard parton production is that it can be computed by using perturbative QCD [3,6].At central rapidities the semihard scatterings with momentum exchanges p T ∼ 2 GeV probe typically parton distributions at x ∼ 2p T / √ s. Especially in nuclear collisions at the CERN Large Hadron Collider (LHC) with √ s = 5.5 TeV, these x-values fall dominantly in the region of a rapid increase of the structure function F p 2 (x, Q 2 ) as observed in deep inelastic ep collisions at HERA [7]. This increase persists down to Q 2 = 1.5 GeV 2 [8], thus strongly enhancing production of semihard partons as discussed in [9]. Nuclear effects in the parton distributions, in particular the observed nuclear shadowing of F A 2 (x, Q 2 ) at small x [10], are expected to be important, although the nuclear gluon distributions are not well known at the moment [11,12].In the above-mentioned studies, the production mechanism of semihard partons, minijets, is based on multiple independent 2 → 2 scatterings of partons. Collinear factorization is assumed to hold, enabling separation of the perturbatively calculable hard processes from the parton distribu...

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Dynamics of parton cascades in highly relativistic nuclear collisions

Cited by 354 publications

References 56 publications

Phenomenological analysis of angular correlations in 7 TeV proton-proton collisions from the CMS experiment

Phenomenological analysis of angular correlations in 7 TeV proton-proton collisions from the CMS experiment

Implementing the LPM effect in a parton cascade model

Minijet and transverse energy production in the BFKL regime

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